Wrightoporia subavellanea Jia J. Chen & B.K. Cui, 2014

Chen, Jia-Jia & Cui, Bao-Kai, 2014, Studies on Wrightoporia from China 3. Wrightoporia subavellanea sp. nov. based on morphological characters and rDNA sequence data, Phytotaxa 175 (4), pp. 225-234 : 226-228

Wrightoporia subavellanea Jia J. Chen & B.K. Cui , sp. nov. ( Figs. 1–2 )

MycoBank no.: MB 808216

Differs from other Wrightoporia species by annual and resupinate basidiocarps with white rhizomorphs, large pores, narrow and strongly dextrinoid skeletal hyphae, broadly ellipsoid to subglobose and strongly amyloid basidiospores, and slightly thick-walled gloeoplerous hyphae in trama.

Type.— CHINA. Guangxi Autonomous Region: Nanning, Qingxiushan Park , alt. 150 m, on rotten wood of Pinus , 9 November 2009, Dai 11484 (holotype, BJFC!) .

Etymology.— subavellanea (Lat.) referring to the species is somewhat similar to Wrightoporia avellanea (Bres.) Pouzar.

Basidiocarps. —Annual, resupinate, soft when fresh, membranous when dry; up to 13 cm long, 5.5 cm wide, and 4 mm thick at the center; pore surface cream to cream buff when fresh, cream to straw-yellow upon drying; margin with white rhizomorphs; pores circular to irregular, 2–3 per mm; dissepiments thin, entire to slightly lacerate with age; subiculum white to cream, cottony, very thin, about 0.2 mm thick; tubes concolorous with pore surface, membranous, up to 3.8 mm thick.

Hyphal structure.— Hyphal system dimitic; generative hyphae with clamp connections; skeletal hyphae strongly dextrinoid, CB +; tissues becoming brown to dark brown permanently in KOH.

Subiculum. —Generative hyphae infrequent, hyaline, thin-walled, occasionally branched, 1.5–2.8 µm in diam; skeletal hyphae dominant, hyaline to yellowish, thick-walled with a narrow lumen, rarely branched, flexuous, interwoven, 1–2.3 µm in diam.

Tubes. —Generative hyphae infrequent, hyaline, thin-walled, frequently branched, 1.3–2 µm in diam; skeletal hyphae dominant, hyaline to yellowish, thick-walled with a narrow lumen to almost solid, unbranched, often flexuous, interwoven, 0.8–1.5 µm in diam; gloeoplerous hyphae infrequent, slightly thick-walled with granular to oily contents appearing refractive in phase contrast illumination, up to 11 µm in diam, embedded in trama; cystidia absent, but cystidioles present, thin-walled, fusoid, tapering, 13–17 × 2.5–3.5 µm; basidia clavate to barrel-shaped, bearing four sterigmata and a basal clamp connection, 12–20 × 4–5 µm; basidioles in shape similar to basidia, but distinctly smaller.

Spores.— Basidiospores broadly ellipsoid to subglobose, hyaline, thick-walled, finely asperulate, strongly amyloid, CB +, (3.6–)3.8–4.2(–4.7) × (2.6–)2.8–3.2(–3.7) µm, L = 4.1 µm, W = 3.7 µm, Q = 1.31 (n = 60/2).

Additional specimens examined.— CHINA. Hainan Prov.: Changjiang County, Bawangling Nat. Res., alt. 800 m, on rotten trunk of Pinus , 10 May 2009, Dai 10826 (paratype, BJFC!) . Guangxi Autonomous Region: Nanning, Qingxiushan Park , alt. 150 m, on rotten wood of Pinus , 9 November 2009, Dai 11484 & 11492 (paratypes, BJFC!) .

Figures

FIGURE 1. Fresh basidiocarps of Wrightoporia subavellanea (Dai 10826). Scale bar = 1cm.

FIGURE 2. Microscopic structures of Wrightoporia subavellanea (Dai 11484). a Basidiospores. b Basidia and basidioles. c Cystidioles. d Hyphae from trama. e Hyphae from subiculum.